If the IRS doesn't care how many days you actually had your place rented and only wants to know how many days it was operated as a business then why doesn't Turbo Tax just ask it that way? And by the way, the other 2/3 of the year that I don't offer my place for rent aren't personal days. I just don't care to have renters here all the time. The unit sits empty 2/3 of the year.
